African American are also very objectified in the gay community. They are synonymous to many as having large penises, so men pursue them solely for sexual gain. They are not considered viable relationship material. It's another form of racism.
There's a lot of anecdotal information from men of color as just being disgustied by how they are approached by men of other races.
There's a great book called "Hung:A Meditation On Black Men In America" that addresses this topic.
"The sexual energy between the mother and son really concerns me!"-random woman behind me at Next to Normal
"I want to meet him after and bang him!"-random woman who exposed her breasts at Rock of Ages, referring to James Carpinello